linux-kernel - Re: [PATCH v2 1/5] rust/io: factor common I/O helpers into Io trait and specialize Mmio<SIZE>

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Message-ID: <202510210730.qW10Mhd0-lkp@intel.com>
Date: Tue, 21 Oct 2025 07:36:54 +0800
From: kernel test robot <lkp@...el.com>
To: Zhi Wang <zhiw@...dia.com>, rust-for-linux@...r.kernel.org
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev, dakr@...nel.org,
	bhelgaas@...gle.com, kwilczynski@...nel.org, ojeda@...nel.org,
	alex.gaynor@...il.com, boqun.feng@...il.com, gary@...yguo.net,
	bjorn3_gh@...tonmail.com, lossin@...nel.org, a.hindborg@...nel.org,
	aliceryhl@...gle.com, tmgross@...ch.edu, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org, cjia@...dia.com, smitra@...dia.com,
	ankita@...dia.com, aniketa@...dia.com, kwankhede@...dia.com,
	targupta@...dia.com, zhiw@...dia.com, zhiwang@...nel.org,
	acourbot@...dia.com, joelagnelf@...dia.com, jhubbard@...dia.com,
	markus.probst@...teo.de
Subject: Re: [PATCH v2 1/5] rust/io: factor common I/O helpers into Io trait
 and specialize Mmio<SIZE>

Hi Zhi,

kernel test robot noticed the following build errors:

[auto build test ERROR on pci/next]
[also build test ERROR on pci/for-linus driver-core/driver-core-next driver-core/driver-core-linus linus/master v6.18-rc2 next-20251020]
[cannot apply to driver-core/driver-core-testing]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Zhi-Wang/rust-io-factor-common-I-O-helpers-into-Io-trait-and-specialize-Mmio-SIZE/20251017-050553
base:   https://git.kernel.org/pub/scm/linux/kernel/git/pci/pci.git next
patch link:    https://lore.kernel.org/r/20251016210250.15932-2-zhiw%40nvidia.com
patch subject: [PATCH v2 1/5] rust/io: factor common I/O helpers into Io trait and specialize Mmio<SIZE>
config: x86_64-rhel-9.4-rust (https://download.01.org/0day-ci/archive/20251021/202510210730.qW10Mhd0-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
rustc: rustc 1.88.0 (6b00bc388 2025-06-23)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251021/202510210730.qW10Mhd0-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202510210730.qW10Mhd0-lkp@intel.com/

All errors (new ones prefixed by >>):

>> error[E0432]: unresolved import `kernel::io::IoRaw`
   --> rust/doctests_kernel_generated.rs:5047:74
   |
   5047 | use kernel::{bindings, device::{Bound, Device}, devres::Devres, io::{Io, IoRaw}};
   |                                                                          ^^^^^ no `IoRaw` in `io`
--
>> error[E0782]: expected a type, found a trait
   --> rust/doctests_kernel_generated.rs:7075:46
   |
   7075 | fn wait_for_hardware<const SIZE: usize>(io: &Io<SIZE>) -> Result<()> {
   |                                              ^^^^^^^^
   |
   = note: `Io<SIZE>` is dyn-incompatible, otherwise a trait object could be used
   help: use a new generic type parameter, constrained by `Io<SIZE>`
   |
   7075 - fn wait_for_hardware<const SIZE: usize>(io: &Io<SIZE>) -> Result<()> {
   7075 + fn wait_for_hardware<const SIZE: usize, T: Io<SIZE>>(io: &T) -> Result<()> {
   |
   help: you can also use an opaque type, but users won't be able to specify the type parameter when calling the `fn`, having to rely exclusively on type inference
   |
   7075 | fn wait_for_hardware<const SIZE: usize>(io: &impl Io<SIZE>) -> Result<()> {
   |                                              ++++
--
>> error[E0782]: expected a type, found a trait
   --> rust/doctests_kernel_generated.rs:5078:18
   |
   5078 |    type Target = Io<SIZE>;
   |                  ^^^^^^^^
--
>> error[E0782]: expected a type, found a trait
   --> rust/doctests_kernel_generated.rs:5082:18
   |
   5082 |         unsafe { Io::from_raw(&self.0) }
   |                  ^^
   |
   help: you can add the `dyn` keyword if you want a trait object
   |
   5082 |         unsafe { <dyn Io>::from_raw(&self.0) }
   |                  ++++   +

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki